I have had a pair for almost 3 years now, hands down my favorite shrimp species. I personally feed live, keep 3-4 choc. chip stars or sand sifters (which ever you can get for cheaper, if you let the LFS know its for a har. usually they are pretty good about it) and just chop off a leg or two every week.
As you make your rounds the starfish will grow back the legs, at the same time they eat all the detritus in your sump.
Never heard of feeding them fish, they are obligate eaters of starfish so I personally don't see it working. If you try come back and let us know how it worked?
Also I'm sure there are multiple species of astrina stars, my har. would only go after the brown/white ones opting to leave the red ones alone.
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